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Wow, WTF is going on with Tesla's to be having these fires that originate inside the passenger area of the car, this is 2 this weekend... crazy! Neither fire appear to be the high voltage battery pack?

 

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Tesla in order to avoid the microchip shortage moved to their own microcontrollers. I wonder if they are running to hot/causing a short.
That is possible, unfortunately there is not much information to go on, and Tesla has no PR department. The fire in Vancouver yesterday was likely a problem with the 12V battery, or main computer, because the guy said he was driving, and got a host of error messages, and then lost 12V power. I have to think a computer would have a circuit breaker and if there was a direct short, would trip? so that makes me think the 12V battery is likely what went bad, perhaps this car had the Lithium Polymer 12V battery, and if overcharged?

On this Model 3, unfortunately we don't have video to show the progression of the event, so just guessing.
 
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